Actual livestock grazing use data are important in evaluating grazing management on specific areas of rangeland administered by the Bureau of Land Management (BLM). These data also provide the information needed to issue grazing bills based on actual grazing use. Data on wildlife, wild horse, and/or wild burro use should also be collected. In most situations, this use is estimated. The use by livestock may also be estimated where actual use data are not available. Care should be taken to distinguish between actual use and estimated use, particularly when they are used in allotment, wildlife habitat area, herd management area, watershed area, or other designated management area evaluations. Actual livestock grazing use data combined with estimated wildlife, wild horse, and wild burro use data are essential in evaluations which may result in changes in grazing management or revision of existing management plans. Knowledge and interpretation of past use provides a basis for future management decisions. Actual use figures alone have no meaning; they should be considered along with authorized use, estimated use, utilization, trend, climate, and any other data available for allotment or other management area evaluation.